@alexagatiss HubSpot does a bad job of guiding users to the right branch type. Please select an “AND/OR branch”. Once you enter the postal code values, you shouldn’t see any commas. If you do, HubSpot will interpret it as one long string, not separate postal codes.
This might help: https://community.hubspot.com/t5/CRM/Filtering-a-view-with-a-comma-separated-list-of-company-IDs/m-p/381499/highlight/true#M122895